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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28b85a3988749a615b57dd9f150c78b79d453b833065e63f8886046002d0371' 
  AND token = 'Vkx0xMsRzAZMyPdc0iRPuDToJ3w6yObNeFVyqEirOa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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