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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb749f1e4f79d86c2060e6cf75afbd4a79a220bdbd0c0f16376df0107ace693c' 
  AND token = 'ZemEvv0OnJy6WVCn6MXl2hAuFzv3w4DXybfLbI7diEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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