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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d35a485ecf975d38b9706ce31209e348d6db4db23a68ea5ee05d89a5577925' 
  AND token = '3nNvralWRYyH57wvo1NUbP1GgF8ii21s/kUD4lgKDrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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