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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55feaada17f692773cf4ef6c5fc61dca01f803544f249711012dcc033c1b873f' 
  AND token = '856gUdGkD6fcmg5A4XTIVK86FeN1RX6WSYO0nsr2F48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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