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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbecd2d41042f009105fd41d8d47db46a6d27ff5f983b6efea5aec9bcfae4c54' 
  AND token = 'hAm//DX2AwNVaNFs0RS0HVX7KwP69+RRsZyTWBkiKuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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