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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765d61bfb71db5df6f51a10fd704464ee17c883e319681961c625bf39ef58fc3' 
  AND token = 'zkJj9aSyut697knU0j1ervvhOHQ7jhPRH69BXgLP97Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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