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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688f0a83114755f2b6deb5e197e1382dd6508c24932f4786102bc51f12251079' 
  AND token = 'ZwRkQQMnrF4kahC81Y02dfy2bH+Z319LI0GjMOYToD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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