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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d8bb02a471f96d78123f747f921f421ea42ed9191e2085f551f2ea6f5ff624' 
  AND token = 'YpC/cnAjiW2F/X8oQp9GcifLoJZ03m5SJBg8WiUZ9Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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