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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626eaa39b8484ebe59a0151d39859a013a3cc0ba0d469a8552dc46da3510e8d7' 
  AND token = '4GtIBawXGx6/PyevgxfkTTSrTV5FFwauBnM7bWsTxs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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