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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e1e61c4c0bad1a95712eb2d654cdbe59d4f8e1e69ab2322a834ba44056cc73' 
  AND token = 'DE/sQAlx6MnOGevW6AY3fyWNpAUnUMqNSo7tvZ8Oyq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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