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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaed07215c1449ce3561bbc37b9ca2e8bf4292b4016107012def64b14cb6ce20' 
  AND token = 'rYQs4BstkwwCRXUGHy+D/1KgKpCn9K9Rau2iE62Dpag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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