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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3899ca8e6cc228f1bc981b1e1d05655a6839912f6cad9dac327941b58402b1a5' 
  AND token = 'v3pEfTw7QkWFJpYfhtEx3Y9zanu1JnR7k2m19HgXiN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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