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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b245f7f68ea66e11f1aaa532055a9e4d43c71b7a746a86f1e2fbbe6b0e82fc11' 
  AND token = 'Hew6oUJyWh3BGYuDj3muXezqDRgHCALqaeWecaWrZW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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