SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7a4529a80222d8b04b237ed2a8499bf8d5af4f23c9707d6c62f342586100de' 
  AND token = 'NQmvmBhNp6olMfVkjOLFKrXEJoVEq76dwJoQ+pW8YDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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