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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ae86bc27c4e983f4d7f4fa016c078e118a5d4496cc7bf611dcb1a32642b1e2' 
  AND token = 'ocaezjYK9lXwwoGLH3L9+Tal+kbeTbucr0NgV5MmoBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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