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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7d0bc1b88eea65a9b56a3b9e1037781d88a02b367f9861ac15b829f93626e4' 
  AND token = 'OgIw7SOY6b4xI0+NY+hc7bJgbqSP9ACNNw6x4QAq3Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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