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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcedeab1e7192b9cd229c7c67ab8e609a105918fe7003e4694f22adceabeb7a9' 
  AND token = 'WtR6rPQ8dCjLhWfhsAPMIwMkDPVrn1AINx2TcHWWDQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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