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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5704185798502a88c1fd0c5e2bc7449d6ce44deacffbfb153c0e759d59f2a309' 
  AND token = 'bEyomQkqgt8fIOrzrFLEnpy/Z6WSlG9Lmvc8C0aijQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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