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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87b872ee4227b6d06674b949c93da4a1725f4a749aeebeee4352a792a189481' 
  AND token = '8iK4mCprXwLtd3KvzrymAcX6XDzHZoHQZnxjJxlwzrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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