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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb929b86fd63ba49eca54ee4b675c103f94b19dc3aa40c5b4f95d107953c30c' 
  AND token = 'TrAFTZIzwavtGC9dexg7AIEeUup1o4J3odcnQZMHgOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}