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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beefa9b9df875bd93815c364c9b38be522234408710266bb07c0ee02e8e41cf8' 
  AND token = 'JcsUyfRmENBcWJPW4l+scXV9iqG9wrwqJ632sqO8HaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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