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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690faf671fa4b914ca8e6d435bc9902cce2ae8f4284fd5afae7480864c40c1fb' 
  AND token = 'SC8gLLWeJvHqoJ32pSizkgAMgYvruYvS4O6Yr1RsxeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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