SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b848eda799474b46410784a26bb7e9c56775b14237584ffd37d6caf772a6e64b' 
  AND token = 'H3Yd7B/uRkHSCXzLRnpFhgBuVSOYjJwc6WB9QJiX1s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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