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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cf255ca9ac1d9b77ec79dc1f05eb61922f0f24a34f1eb4a211505d06ccb63a' 
  AND token = '3+F7a47tk/yZgkN7tcEg6mJBuY0J9DV6rxHfj8LpVbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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