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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33806ea70f5f4d598588ee217af54c2efd01eb42af6fdf5f25f8235596999d6' 
  AND token = '+jbl2KXt1beH2Uh8h2tBOCpUumSwfcLUBtNO1S7k10E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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