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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12314f05b5aa90cf8e25b1c2587d9e9cf784ca15d0c07c81486cc5d552a9d347' 
  AND token = 'NSIppZnNfylCeLCuJLoH9mQQz1IlfpiKG/K1m1dfqKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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