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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a5828fdf5a3a8169ce70b05086f48d3330f7e065b0f93a000e0ae907410e1d' 
  AND token = 'NrdQBxd2qzxTfCS2YeSQ1Zi0K9SxkkBKiB80PkeYeUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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