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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67afe728d83517bf40771d768d6c2dfe72a5cd9b5eafb8d0fbc2707905ad9c9' 
  AND token = 'uhaNwRmRkVf7WF41aWYA9i4Ljpe26uruZ36QjEiIlfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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