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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bcfae0654aac77412d155cde6ae6b0ec34ba91a7b19d5cc58a50153c9f6a991' 
  AND token = 'Y6603QXqUdwIzJSdrJnSOIfiznvKGVDeVAZ/oNen8lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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