SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25926f7c1da984a968c4e60ebf1b73e8cd44174af0ecda470fb4387732356ea' 
  AND token = 'f3ZcUvMqpAkYuZRKbwhcMjUQa2Zd+RMnGv8VJZukjnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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