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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28bc2de5ca82a8c85d67d5a4d3e5488454cfe463024f7637a02eedc7e40d51c' 
  AND token = 'vmzugxjD4x+INac3Ub0+aVK0tcgrcQFFJYId+lWPEwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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