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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e7ca0de1ea42d96b6f2f820ae49d0722b062af6e892f03f082a2d4e1303534' 
  AND token = '99ziLXxc7cw3eRni+uZ3w4DZveWcfHtxGYbwTJ2Fc0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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