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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2530db25b12f49e24a93c3f4721b3c0b145ef5ed1b7d9d4a94aa9d669fe77bf9' 
  AND token = 'PD5yoIFI1sWH9lry7GzjbADrtm3Z4KvdHh22S5sB8SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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