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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8b06f42e06c4f64941c4a6833654407be8b9b1f15780a45d90a56c85b01b11' 
  AND token = 'GSvEUrZeMwVzIEHU12WhYDO3i8QTIUpCsc77YA9P2+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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