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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d2a51876da11517d635ea43eeebdfb7e4ff9854345a0cc5cd0eabec7d2f1fd' 
  AND token = 'WYTcmooSv5+bTMsLg/ZbPkRXFT83Do1bDixfttORytg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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