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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d75abe270effb2efec69aaf8ef7554cbff925cc8f5ae62e886acf9a828e9866' 
  AND token = 'UBu87a0Un7YRELVd72y2apGoHT16xUEg/Zp5eOap+yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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