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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c3591e5f2a3b84d943b2dc3b81258d24af9578bc207f3e386ba41f04abf905' 
  AND token = 'g8+Y8JS7myaTwgNb/crSJ3FfRUY/7CJX3VZp4p2zkAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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