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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08739dfbf2b64da4a678cf490b4ef8f739e9ae5b3903ddfe11b74c04da31ddf7' 
  AND token = 'G/j8Is0B9yMDo9qcEkX1FF6IkYV+W89Aj34gdg837Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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