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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '404caab58b926ce51117b9d85261279a3e89737f49df262c4ce22662a6dfe34f' 
  AND token = '+99FEmqjGUhg9dFUere7zdyS18S1eAkuhEMNmFuTT1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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