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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2844e1ffe4e13e1d7aa3c5ae0737d3e3e2be1e053ab6e5fc74362e6c92aa46' 
  AND token = 'xbSyQyZfjJOnqSWXuZyJGA58H3N5i5m6a0aKu6ayhJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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