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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403d028ce719243c0a7f86596b8008b2a9e677d0da6eb5f2d754ee4aeae502ab' 
  AND token = 'tUvBbMIsVdUTE0yDEx0CZcZ03uA9VoYftpGGy/4tLjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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