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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63014e0c58e0e177be488521b590770adb644b564218f89544f88ad92d32314' 
  AND token = 'jn5Pkt0ZxAgljq0vsE9q4v4R8PPVfVxQyIGTjKVeGfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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