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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed230774dee8a9489c99b8eb81552222f2a6ab123ab5a17b126a7e3e9e5c39ac' 
  AND token = '1hnoha44a4LjqkO1g7iniedPM9gVZ91lGdx51i/X8+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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