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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162df2b8197a9994f8ef7a1873a8ac78786d117c4563aa2f75c2d2643dea3d41' 
  AND token = '0t/VjBqMxzQ9d93VuL6TyA/WesnzvV2ffxJuX84UprU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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