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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '545ae1b379729f8afd129b58c539beb29fd801e1f8f55dd9f15ae7882cdbf3cf' 
  AND token = 'DR0c4QLBFg/leGwg1gi/ijGmbzahjcM72xsGDGHKxg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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