SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6aab5d1b136f08bad4e4a353b6b922c6f5b82f6fc9f9ec17cbb1e70c95d7e46' 
  AND token = 'ceKoHUjGGHI39DiYxtIIhUuQBQszrT4Ys6gdWDRPXZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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