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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1541071d6f3eaf18cb1abfb1fdfd4b15a7124ca87abf63d4e9cc999feebd7e9e' 
  AND token = '79d+aV39hno1bqoCIlYR7+vR/mqyv7lHrX8FOi2PJ40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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