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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940c3418d31cc27727353329e7c6559045f79d89c0e5dced4761b20d5a603ae1' 
  AND token = 'EVVLQ7v1jHp3rnB6QA++KdUJ9gLnJpwNrz0WoKDXxEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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