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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3237ca336651433080ee5cfe011db0dcd56b4b7369efae6e763ab7452604052' 
  AND token = 'shfofrPQ1WvSvc2rUUY0UbvY7gaS8bVUTN6p4ciaMRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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