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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93310560e4e07ccc28efd1d1666dc7c6e44c1480893fe9fe5f16e9c2db92586e' 
  AND token = '+QknRK9UUUE8mGi5k6wW4SoinUfS4HXqQ29Gpe+tihs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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