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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfeac559a05e06122c55dfcf9f6caf5ef803288f195a4d90e00c6af506f4522' 
  AND token = 'N7JHtNC6lU/vNxVjAYol5v+rwekwC5jEYpvrzUQb3k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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