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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81dd1ed1c6d15e445d92af300654ef63a1905b190ce062e63865c63215ee21f' 
  AND token = 'ifJ93fdL/6SLACPYxAlbh1QibCvxf1AxMu4ZuZrRp9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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