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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a816f297816efb7a32498c5415f316f7f24e10534a61f1b315d94d5c5ae52d' 
  AND token = 'xDkIKvUcD59Ra+FahVd7ihtTUgBWGGc3rSaxoKJVU7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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