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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57dc24d563e140abfb702f5e9d7af62f7774d366604422bbf18cd65e622797c' 
  AND token = 'q9pNNnvSsZpcoEvJOx+P7Mq2NiQ0X8A3oyB3w2t3eyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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