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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb1f912701dae1dd0a6b157f4c0b9821264cf34ef54c9db05fad02ee1650ef5' 
  AND token = 'LkNGSSIo4RxCByYMVd2VnJmt2uifcTuUTcf6Lp1BaEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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