SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f45f92649fcd47ec567d7e9b8819378e2b3be9fa47d44e4041c2309c5b6bf18' 
  AND token = 'Mt63v6gmKRyw3zEfVc0G/r1LXsB3vLz+vX14Jtp0qNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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