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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29822da4389a5341dbaddc8f1d12034a88808705f71f444f7b1077d34249949' 
  AND token = 'JAMfbwFfMLT6N7Y2qUwF6cgwcClGLXraNoHL6aTUbL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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