SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f6b43878aef26c4b03d61eb8134bc26f32c1a1a2a1f897b07e70e61c0f5a6c8' 
  AND token = 'mTNggdwrhguUoAGJ0ZvpdFy6wDrBpKAdZYiFcTLGzFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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