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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7c68e3b4fa0106825a0aea4e0c84e2be54b3775ebd41b5fc31d31636569234' 
  AND token = 'U/I0vfg/ZOOl6qQDXwfO5mI55/hd31GzedSAy1Ie9nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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