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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474101714a8dddbdb87ae667dde2a31b452252a84d65615aee78414d45d1b11a' 
  AND token = '5dv/1nQMU5XVz9ThEsfKufMT6YAd8I8ghPItTAskWCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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